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Resistivity-controllable conductive silicon carbide foam ceramic material and its preparing process

A technology of foamed ceramics and silicon carbide, which is applied in the field of conductive silicon carbide foamed ceramic materials and its preparation, can solve the problems of difficult control of pore volume and size, non-dense foamed silicon carbide ceramics, and low initial density, and it is easy to achieve porosity Control, low preparation cost, high strength effect

Inactive Publication Date: 2007-05-16
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Since the first three methods do not have a hot pressing process, the initial density is not high, and the prepared foamy silicon carbide ceramics are not dense, so the strength is low, and the solid-state reaction sintering method and the silicon resin pyrolysis method are difficult to control the pore volume and size; and Vapor deposition method faces problems such as high production cost and slow speed

Method used

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  • Resistivity-controllable conductive silicon carbide foam ceramic material and its preparing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Co-dissolve silicon carbide powder with an average particle size of 2 μm, aminophenol-formaldehyde resin, titanium powder with an average particle size of 5 μm, and p-toluenesulfonic acid with a weight ratio of 55%: 35%: 5%: 5% in absolute ethanol to make a slurry (the solute content is 30%), the polyurethane foam of pore diameter 1mm is cut into required size and is immersed in the described slurry evenly, soaks 1 minute, after taking out, squeeze out excess slurry, after air-drying, 50 ℃ of semi-cured 10 Minutes, put it into a high-pressure container, fill it with nitrogen to make the air pressure reach 12MPa, raise the temperature to 250°C, and keep it warm for 1 hour to solidify. Under the protection of argon, it is pyrolyzed to form a carbon skeleton; the heating rate is 2°C per minute, the temperature is raised to 800°C, and the temperature is kept for 0.5 hours. Vacuum siliconize the titanium-containing carbon skeleton (add silicon powder 3 times the weight of th...

Embodiment 2

[0046] Co-dissolve silicon carbide powder with an average particle size of 2 μm, epoxy resin (brand name EP0141-310), titanium powder with an average particle size of 3.5 μm, and p-toluenesulfonic acid with a weight ratio of 37%: 55%: 5%: 3% In water ethanol, make a slurry (solute content is 40%), cut the polyurethane foam with a pore diameter of 2mm into the required size and immerse it evenly in the slurry, soak for 1 minute, squeeze out the excess slurry after taking it out , after air-drying and semi-curing at 50°C for 10 minutes, put it into a high-pressure container, fill it with nitrogen to make the air pressure reach 10MPa, raise the temperature to 200°C, and keep it for 1 hour to cure. Under the protection of argon, it is pyrolyzed to form a carbon skeleton; the heating rate is 2°C per minute, the temperature is raised to 900°C, and the temperature is kept for 0.5 hours. Vacuum siliconize the carbon skeleton (add silicon powder twice the weight of the carbon skeleton ...

Embodiment 3

[0048] The thermosetting phenolic resin and furfural resin with a weight ratio of 50% were co-dissolved in absolute ethanol to make a slurry solution, and then the weight ratio was respectively 94%: 6% silicon carbide powder with an average particle size of 5 μm and an average Titanium powder with a particle size of 3.5 μm is uniformly added to the above solution to form a slurry with a resin / silicon carbide powder volume ratio of 1 / 9 (solute content is 20%). Cut the polyurethane foam with a pore diameter of 2mm into the required size and immerse it evenly in the slurry, take it out and squeeze out the excess slurry, soak for 1 minute, air-dry and semi-cure at 50°C for 10 minutes, put it in a high-pressure container, Infuse nitrogen gas to make the air pressure reach 11MPa, raise the temperature to 230°C, and keep the temperature for 1 hour to cure. Under the protection of argon, it is pyrolyzed to form a carbon skeleton; the heating rate is 2°C per minute, the temperature is ...

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Abstract

The invention discloses a preparing method of conductive carbofrax foaming ceramic with controllable resistance rate, which adopts polygon patterned sealed ring as basic unit with each basic unit connecting to form three-dimensional communicating network, wherein the corresponding density of ceramic bar of polygon patterned sealed ring is not less than 99%; the component contains 80-96% carbofrax, 10-2% metal phase and 10-2% silicon phase; the changing scale of resistance rate is 5-0.01 omega .cm.

Description

technical field [0001] The invention relates to a conductive silicon carbide foam ceramic material, in particular to a conductive silicon carbide foam ceramic material with controllable resistivity and a preparation method thereof. Background technique [0002] Ceramic foam has good permeability, adsorption capacity and large specific surface area. The reaction gas passes through the pores of ceramic foam coated with catalyst, which will greatly improve the conversion efficiency and reaction speed. At present, the commonly used catalyst porous carriers are mainly alumina and silicon oxide. and cordierite etc. Because these oxide ceramics are insulators, it is difficult to directly energize to achieve active heating, and the catalytic effect can only be achieved after reaching the reaction temperature of the catalyst in passive heating. Therefore, their application in the fields that need to reach the optimum reaction temperature quickly is limited. [0003] Foamed silicon ...

Claims

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Application Information

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IPC IPC(8): C04B35/565C04B38/08C04B35/622
Inventor 张劲松曹小明田冲杨振明刘强
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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